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Refactor long double information into bits/long-double.h


I would like review of this patch.

Information about whether the ABI of long double is the same as that
of double is split between bits/mathdef.h and bits/wordsize.h.

When the ABIs are the same, bits/mathdef.h defines
__NO_LONG_DOUBLE_MATH.  In addition, in the case where the same glibc
binary supports both -mlong-double-64 and -mlong-double-128,
bits/wordsize.h defines __LONG_DOUBLE_MATH_OPTIONAL, along with
__NO_LONG_DOUBLE_MATH if this particular compilation is with
-mlong-double-64.

As part of the refactoring I proposed in
<https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>, this
patch puts all that information in a single header,
bits/long-double.h.  It is included from sys/cdefs.h alongside the
include of bits/wordsize.h, so other headers generally do not need to
include bits/long-double.h directly.

Previously, six bits/mathdef.h headers and five bits/wordsize.h
headers had this long double information.  After the patch, it's all
in six bits/long-double.h headers.  Furthermore, most of those new
headers are not architecture-specific.  Architectures with optional
long double all use the ldbl-opt sysdeps directory, either in the
order (ldbl-64-128, ldbl-opt, ldbl-128) or (ldbl-128ibm, ldbl-opt).
Thus a generic header for the case where long double = double, and
headers in ldbl-128, ldbl-96 and ldbl-opt, suffices to cover every
architecture except for cases where long double properties vary
between different ABIs sharing a set of installed headers; fortunately
all the ldbl-opt cases share a single compiler-predefined macro
__LONG_DOUBLE_128__ that can be used to tell whether this compilation
is -mlong-double-64 or -mlong-double-128.

The two cases where a set of headers is shared between ABIs with
different long double properties, MIPS (o32 has long double = double,
other ABIs use ldbl-128) and SPARC (32-bit has optional long double,
64-bit has required long double), need their own bits/long-double.h
headers.

As with bits/wordsize.h, multiple-include protection for this header
is generally implicit through the include guards on sys/cdefs.h, and
multiple inclusion is harmless in any case.  There is one subtlety:
the header must not define __LONG_DOUBLE_MATH_OPTIONAL if
__NO_LONG_DOUBLE_MATH was defined before its inclusion, because doing
so breaks how sysdeps/ieee754/ldbl-opt/nldbl-compat.h defines
__NO_LONG_DOUBLE_MATH itself before including system headers.  Subject
to keeping that working, it would be reasonable to move these macros
from defined/undefined #ifdef to always-defined 1/0 #if semantics, but
this patch does not attempt to do so, just rearranges where the macros
are defined.

I had thought this patch would allow eliminating the inclusion of
bits/mathdef.h from complex.h, but that is not quite the case, because
of the code in sysdeps/alpha/bits/mathdef.h specific to inclusion from
complex.h; something would need doing about that ABI compatibility
code to eliminate that inclusion, or to eliminate bits/mathdef.h
completely.

Tested for x86_64 and x86.  Also did compilation-only testing with
build-many-glibcs.py.

2016-11-24  Joseph Myers  <joseph@codesourcery.com>

	* bits/long-double.h: New file.
	* sysdeps/ieee754/ldbl-128/bits/long-double.h: Likewise.
	* sysdeps/ieee754/ldbl-96/bits/long-double.h: Likewise.
	* sysdeps/ieee754/ldbl-opt/bits/long-double.h: Likewise.
	* sysdeps/mips/bits/long-double.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/long-double.h: Likewise.
	* math/Makefile (headers): Add bits/long-double.h.
	* misc/sys/cdefs.h: Include <bits/long-double.h>.
	* stdlib/strtold.c: Include <bits/long-double.h> instead of
	<bits/wordsize.h>.
	* bits/mathdef.h [!__NO_LONG_DOUBLE_MATH]: Remove conditional
	code.
	* sysdeps/arm/bits/mathdef.h [!__NO_LONG_DOUBLE_MATH]: Remove
	conditional code.
	* sysdeps/hppa/fpu/bits/mathdef.h [!__NO_LONG_DOUBLE_MATH]:
	Likewise.
	* sysdeps/mips/bits/mathdef.h: Do not include <sgidefs.h>.
	[!__NO_LONG_DOUBLE_MATH && _MIPS_SIM == _ABIO32]: Remove
	conditional code.
	* sysdeps/s390/s390-32/bits/wordsize.h
	[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
	Likewise.
	* sysdeps/s390/s390-64/bits/wordsize.h
	[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
	Likewise.
	* sysdeps/sh/sh4/bits/mathdef.h [!__NO_LONG_DOUBLE_MATH]:
	Likewise.
	* sysdeps/tile/bits/mathdef.h [!__NO_LONG_DOUBLE_MATH]: Likewise.
	* sysdeps/unix/sysv/linux/alpha/bits/wordsize.h
	[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/wordsize.h
	[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
	Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/wordsize.h
	[!__NO_LONG_DOUBLE_MATH && !__LONG_DOUBLE_MATH_OPTIONAL]:
	Likewise.

diff --git a/bits/long-double.h b/bits/long-double.h
new file mode 100644
index 0000000..2e3c7fd
--- /dev/null
+++ b/bits/long-double.h
@@ -0,0 +1,39 @@
+/* Properties of long double type.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This header is included by <sys/cdefs.h>.
+
+   If long double is ABI-compatible with double, it should define
+   __NO_LONG_DOUBLE_MATH to 1; otherwise, it should leave
+   __NO_LONG_DOUBLE_MATH undefined.
+
+   If this build of the GNU C Library supports both long double
+   ABI-compatible with double and some other long double format not
+   ABI-compatible with double, it should define
+   __LONG_DOUBLE_MATH_OPTIONAL to 1; otherwise, it should leave
+   __LONG_DOUBLE_MATH_OPTIONAL undefined.
+
+   If  is already defined, this header must not define
+   anything; this is needed to work with the definition of
+   __NO_LONG_DOUBLE_MATH in nldbl-compat.h.  */
+
+/* In the default version of this header, long double is
+   ABI-compatible with double.  */
+#ifndef __NO_LONG_DOUBLE_MATH
+# define __NO_LONG_DOUBLE_MATH	1
+#endif
diff --git a/bits/mathdef.h b/bits/mathdef.h
index d557d08..9d19542 100644
--- a/bits/mathdef.h
+++ b/bits/mathdef.h
@@ -48,9 +48,3 @@ typedef double double_t;	/* `double' expressions are evaluated as
 #endif
 
 #endif	/* ISO C99 */
-
-#ifndef __NO_LONG_DOUBLE_MATH
-/* Signal that we do not really have a `long double'.  The disables the
-   declaration of all the `long double' function variants.  */
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/math/Makefile b/math/Makefile
index e84f86a..3056ff3 100644
--- a/math/Makefile
+++ b/math/Makefile
@@ -27,7 +27,8 @@ headers		:= math.h bits/mathcalls.h bits/mathinline.h bits/huge_val.h \
 		   fpu_control.h complex.h bits/cmathcalls.h fenv.h \
 		   bits/fenv.h bits/fenvinline.h bits/mathdef.h tgmath.h \
 		   bits/math-finite.h bits/math-vector.h \
-		   bits/libm-simd-decl-stubs.h bits/iscanonical.h
+		   bits/libm-simd-decl-stubs.h bits/iscanonical.h \
+		   bits/long-double.h
 
 # FPU support code.
 aux		:= setfpucw fpu_control
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 9298dd6..e07f3fc 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -439,6 +439,7 @@
 #endif
 
 #include <bits/wordsize.h>
+#include <bits/long-double.h>
 
 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
 # define __LDBL_COMPAT 1
diff --git a/stdlib/strtold.c b/stdlib/strtold.c
index bb46f23..251663f 100644
--- a/stdlib/strtold.c
+++ b/stdlib/strtold.c
@@ -20,7 +20,7 @@
 /* The actual implementation for all floating point sizes is in strtod.c.
    These macros tell it to produce the `float' version, `strtof'.  */
 
-#include <bits/wordsize.h>
+#include <bits/long-double.h>
 
 #ifdef __LONG_DOUBLE_MATH_OPTIONAL
 # include <wchar.h>
diff --git a/sysdeps/arm/bits/mathdef.h b/sysdeps/arm/bits/mathdef.h
index ae0bcb7..1f4c428 100644
--- a/sysdeps/arm/bits/mathdef.h
+++ b/sysdeps/arm/bits/mathdef.h
@@ -47,9 +47,3 @@ typedef double double_t;	/* `double' expressions are evaluated as
 # endif
 
 #endif	/* ISO C99 */
-
-#ifndef __NO_LONG_DOUBLE_MATH
-/* Signal that we do not really have a `long double'.  This disables the
-   declaration of all the `long double' function variants.  */
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/sysdeps/hppa/fpu/bits/mathdef.h b/sysdeps/hppa/fpu/bits/mathdef.h
index 99c9cff..4482c1f 100644
--- a/sysdeps/hppa/fpu/bits/mathdef.h
+++ b/sysdeps/hppa/fpu/bits/mathdef.h
@@ -33,11 +33,3 @@ typedef double double_t;	/* `double' expressions are evaluated as
 # define FP_ILOGBNAN	(2147483647)
 
 #endif	/* ISO C99 */
-
-#ifndef __NO_LONG_DOUBLE_MATH
-/* On hppa `long double' and `double' are 64-bits.  So, libm is built
-   with NO_LONG_DOUBLE defined.  The following define ensures the library
-   and headers are consistent.  This disables the declaration of all the
-   `long double' function variants.  */
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/sysdeps/ieee754/ldbl-128/bits/long-double.h b/sysdeps/ieee754/ldbl-128/bits/long-double.h
new file mode 100644
index 0000000..3f10da8
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128/bits/long-double.h
@@ -0,0 +1,20 @@
+/* Properties of long double type.  ldbl-128 version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* long double is distinct from double, so there is nothing to
+   define here.  */
diff --git a/sysdeps/ieee754/ldbl-96/bits/long-double.h b/sysdeps/ieee754/ldbl-96/bits/long-double.h
new file mode 100644
index 0000000..180a7cf
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-96/bits/long-double.h
@@ -0,0 +1,20 @@
+/* Properties of long double type.  ldbl-96 version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* long double is distinct from double, so there is nothing to
+   define here.  */
diff --git a/sysdeps/ieee754/ldbl-opt/bits/long-double.h b/sysdeps/ieee754/ldbl-opt/bits/long-double.h
new file mode 100644
index 0000000..dce98c3
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-opt/bits/long-double.h
@@ -0,0 +1,24 @@
+/* Properties of long double type.  ldbl-opt version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __NO_LONG_DOUBLE_MATH
+# define __LONG_DOUBLE_MATH_OPTIONAL	1
+# ifndef __LONG_DOUBLE_128__
+#  define __NO_LONG_DOUBLE_MATH		1
+# endif
+#endif
diff --git a/sysdeps/mips/bits/long-double.h b/sysdeps/mips/bits/long-double.h
new file mode 100644
index 0000000..b51fce8
--- /dev/null
+++ b/sysdeps/mips/bits/long-double.h
@@ -0,0 +1,23 @@
+/* Properties of long double type.  MIPS version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sgidefs.h>
+
+#if !defined __NO_LONG_DOUBLE_MATH && _MIPS_SIM == _ABIO32
+# define __NO_LONG_DOUBLE_MATH	1
+#endif
diff --git a/sysdeps/mips/bits/mathdef.h b/sysdeps/mips/bits/mathdef.h
index 3a11627..030cd3d 100644
--- a/sysdeps/mips/bits/mathdef.h
+++ b/sysdeps/mips/bits/mathdef.h
@@ -19,8 +19,6 @@
 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
 #endif
 
-#include <sgidefs.h>
-
 #if defined  __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
 # define _MATH_H_MATHDEF	1
 
@@ -35,9 +33,3 @@ typedef double double_t;	/* `double' expressions are evaluated as
 # define FP_ILOGBNAN	2147483647
 
 #endif	/* ISO C99 */
-
-#if ! defined __NO_LONG_DOUBLE_MATH && _MIPS_SIM == _ABIO32
-/* Signal that we do not really have a `long double'.  This disables the
-   declaration of all the `long double' function variants.  */
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/sysdeps/s390/s390-32/bits/wordsize.h b/sysdeps/s390/s390-32/bits/wordsize.h
index c7a5fbf..129e471 100644
--- a/sysdeps/s390/s390-32/bits/wordsize.h
+++ b/sysdeps/s390/s390-32/bits/wordsize.h
@@ -9,14 +9,3 @@
 #endif
 
 #define __WORDSIZE_TIME64_COMPAT32     0
-
-#if !defined __NO_LONG_DOUBLE_MATH && !defined __LONG_DOUBLE_MATH_OPTIONAL
-
-/* Signal that we didn't used to have a `long double'. The changes all
-   the `long double' function variants to be redirects to the double
-   functions.  */
-# define __LONG_DOUBLE_MATH_OPTIONAL   1
-# ifndef __LONG_DOUBLE_128__
-#  define __NO_LONG_DOUBLE_MATH        1
-# endif
-#endif
diff --git a/sysdeps/s390/s390-64/bits/wordsize.h b/sysdeps/s390/s390-64/bits/wordsize.h
index 31e0ec6..00e88b0 100644
--- a/sysdeps/s390/s390-64/bits/wordsize.h
+++ b/sysdeps/s390/s390-64/bits/wordsize.h
@@ -9,14 +9,3 @@
 #endif
 
 #define __WORDSIZE_TIME64_COMPAT32     0
-
-#if !defined __NO_LONG_DOUBLE_MATH && !defined __LONG_DOUBLE_MATH_OPTIONAL
-
-/* Signal that we didn't used to have a `long double'. The changes all
-   the `long double' function variants to be redirects to the double
-   functions.  */
-# define __LONG_DOUBLE_MATH_OPTIONAL   1
-# ifndef __LONG_DOUBLE_128__
-#  define __NO_LONG_DOUBLE_MATH        1
-# endif
-#endif
diff --git a/sysdeps/sh/sh4/bits/mathdef.h b/sysdeps/sh/sh4/bits/mathdef.h
index 21ce094..e5d2849 100644
--- a/sysdeps/sh/sh4/bits/mathdef.h
+++ b/sysdeps/sh/sh4/bits/mathdef.h
@@ -38,9 +38,3 @@ typedef double double_t;
 # define FP_ILOGBNAN	0x7fffffff
 
 #endif	/* ISO C99 */
-
-#ifndef __NO_LONG_DOUBLE_MATH
-/* Signal that we do not really have a `long double'.  The disables the
-   declaration of all the `long double' function variants.  */
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/sysdeps/tile/bits/mathdef.h b/sysdeps/tile/bits/mathdef.h
index 2db81b4..0d43321 100644
--- a/sysdeps/tile/bits/mathdef.h
+++ b/sysdeps/tile/bits/mathdef.h
@@ -46,9 +46,3 @@ typedef double double_t;
 # endif
 
 #endif /* ISO C99 */
-
-#ifndef __NO_LONG_DOUBLE_MATH
-/* Signal that we do not really have a `long double'.  This disables the
-   declaration of all the `long double' function variants.  */
-# define __NO_LONG_DOUBLE_MATH	1
-#endif
diff --git a/sysdeps/unix/sysv/linux/alpha/bits/wordsize.h b/sysdeps/unix/sysv/linux/alpha/bits/wordsize.h
index f0961f6..2ef70a9 100644
--- a/sysdeps/unix/sysv/linux/alpha/bits/wordsize.h
+++ b/sysdeps/unix/sysv/linux/alpha/bits/wordsize.h
@@ -17,14 +17,3 @@
 
 #define __WORDSIZE	64
 #define __WORDSIZE_TIME64_COMPAT32	0
-
-#if !defined __NO_LONG_DOUBLE_MATH && !defined __LONG_DOUBLE_MATH_OPTIONAL
-
-/* Signal that we didn't used to have a `long double'. The changes all
-   the `long double' function variants to be redirects to the double
-   functions.  */
-# define __LONG_DOUBLE_MATH_OPTIONAL	1
-# ifndef __LONG_DOUBLE_128__
-#  define __NO_LONG_DOUBLE_MATH		1
-# endif
-#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/wordsize.h b/sysdeps/unix/sysv/linux/powerpc/bits/wordsize.h
index 109f08c..04ca9de 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/wordsize.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/wordsize.h
@@ -9,14 +9,3 @@
 # define __WORDSIZE32_SIZE_ULONG	0
 # define __WORDSIZE32_PTRDIFF_LONG	0
 #endif
-
-#if !defined __NO_LONG_DOUBLE_MATH && !defined __LONG_DOUBLE_MATH_OPTIONAL
-
-/* Signal the glibc ABI didn't used to have a `long double'.
-   The changes all the `long double' function variants to be redirects
-   to the double functions.  */
-# define __LONG_DOUBLE_MATH_OPTIONAL   1
-# ifndef __LONG_DOUBLE_128__
-#  define __NO_LONG_DOUBLE_MATH        1
-# endif
-#endif
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/long-double.h b/sysdeps/unix/sysv/linux/sparc/bits/long-double.h
new file mode 100644
index 0000000..20039ce
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/bits/long-double.h
@@ -0,0 +1,26 @@
+/* Properties of long double type.  SPARC version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <bits/wordsize.h>
+
+#if !defined __NO_LONG_DOUBLE_MATH && __WORDSIZE == 32
+# define __LONG_DOUBLE_MATH_OPTIONAL   1
+# ifndef __LONG_DOUBLE_128__
+#  define __NO_LONG_DOUBLE_MATH        1
+# endif
+#endif
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/wordsize.h b/sysdeps/unix/sysv/linux/sparc/bits/wordsize.h
index 121b4fe..7562875 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/wordsize.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/wordsize.h
@@ -9,16 +9,3 @@
 # define __WORDSIZE32_PTRDIFF_LONG	0
 # define __WORDSIZE_TIME64_COMPAT32	0
 #endif
-
-#if !defined __NO_LONG_DOUBLE_MATH && !defined __LONG_DOUBLE_MATH_OPTIONAL
-
-# if __WORDSIZE == 32
-/* Signal that in 32bit ABI we didn't used to have a `long double'.
-   The changes all the `long double' function variants to be redirects
-   to the double functions.  */
-#  define __LONG_DOUBLE_MATH_OPTIONAL   1
-#  ifndef __LONG_DOUBLE_128__
-#   define __NO_LONG_DOUBLE_MATH        1
-#  endif
-# endif
-#endif

-- 
Joseph S. Myers
joseph@codesourcery.com


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